Abstract
A problem exists in the use of magnesium alloys in aircraft of determining the resisting moment in bending. Special methods and theories have to be used in order to predict these values because of the lower yield strength of wrought magnesium alloys in compression as compared to tension. The standard classic for• m u l a / = Mc/I is not applicable, and some other formula is necessary. Experimental tests were made which agreed fairly well with the theoretical formula: MT = bh*@Qe + 2<2,)/(6c + etY where Mr = moment of resistance b — width of beam h = depth of beam 2(2 = first moment of stress-strain curve about stress axis e = strain in outermost fiber Subscripts c and t refer to compression and tension, respectively. The tests were made on various magnesium alloys of several different sizes. The deviations of experimental results from theory were not excessive.
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